However, it is also possible to enable IP on the Serial interface and bring it up without assigning a unique IP address to it. Logically, to enable IP on interface S0, you would need to configure a unique IP address on it. Router A's Ethernet 0 interface can be configured with an IP address as shown below: interface Ethernet0 Router A has a serial interface S0 and an Ethernet interface E0. What is an Unnumbered Interface?Ĭonsider the network shown below. Conventionsįor more information on document conventions, refer to Cisco Technical Tips Conventions. This document is not restricted to specific software and hardware versions. There are no specific requirements for this document. The ip unnumbered interface can "borrow" the IP address of another interface already configured on the router, which conserves network and address space. The ip unnumbered configuration command allows you to enable IP processing on a serial interface without assigning it an explicit IP address. This document explains the concept of IP unnumbered, and provides several configuration examples for reference.
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